French authorities have detained two of the suspected robbers believed to have stolen precious crown jewels from the Louvre in a museum heist that stunned the world, officials said on Sunday.

A swarm of investigators had been mobilised to track down the thieves who robbed the world-renowned museum in broad daylight on October 19, making off with jewellery worth an estimated US$102 million in just a few minutes.

Paris prosecutor Laure Beccuau said they had "carried out arrests on Saturday evening".

"One of the men arrested was about to leave the country" from Paris-Charles de Gaulle airport, Beccuau said.

A source close to the case told AFP the man was about to board a plane for Algeria.

The second man had been detained not long afterward in the Paris region, media reports said.

The two men were taken into police custody on suspicion of organised theft and criminal conspiracy. They could be held up to 96 hours.

Beccuau deplored the public revelation of the arrests, first revealed in media reports, warning they "can only hinder the efforts of the 100 investigators mobilised" in the hunt for the jewels and the perpetrators.

Interior Minister Laurent Nunez also called for confidentiality while congratulating the investigators "who have worked tirelessly", in a post on X.

In the heist last Sunday, the robbers clambered up the extendable ladder of a stolen movers' truck and, using cutting equipment, broke into a first-floor gallery that houses royal gems.

They dropped a diamond- and emerald-studded crown as they fled down the ladder and onto scooters, but managed to steal eight other pieces, include an emerald-and-diamond necklace that Napoleon Bonaparte gave his wife, Empress Marie-Louise.

The brazen theft has made headlines across the world and sparked a debate in France about the security of cultural institutions.

The Louvre's director has admitted the robbers had taken advantage of a blind spot in the security surveillance of the museum's outside walls.

But Beccuau said public and private security cameras elsewhere had allowed detectives to track the thieves "in Paris and in surrounding regions".

Investigators were also able to find DNA samples and fingerprints at the scene from items left behind by the robbers as they fled, including gloves, a high-vis vest, a blowtorch and power tools.

They also dropped a crown that once belonged to Empress Eugenie, the wife of Napoleon III, which was damaged and needs to be restored.

The rest of the pieces have not been recovered and risk to be broken apart, their precious metal settings melted down.

Nunez expressed his "concern for the jewellery" in an interview with French weekly La Tribune Dimanche on Sunday, saying the heist appeared to have been carried out by an organised crime group but adding that "thieves are always eventually caught".

"The loot is unfortunately often stashed abroad. I hope that's not the case – I remain confident," he added.

Culture Minister Rachida Dati said on X on Friday she had requested findings from an investigation into the Louvre's security by early next week to "announce concrete measures to secure" the museum. (AFP)